Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac18b71eb8945062…

MALICIOUS

PDF

89.0 KB Created: 2021-09-13 11:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e7637e5f1d3ab2e385d31bfd7cf1512 SHA-1: 409054dc1e317f07bdaf0e9616175bf9111f8452 SHA-256: ac18b71eb894506216a4778336c2320610e795ece12db1718846fcfb4cb719bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload storage, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly indicate maliciousness, and the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic confirms the document's intent to defraud users with a fake prize or parcel delivery scheme. No scripts were extracted, but the embedded URLs and document structure are sufficient to identify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883facbd8---67826438832.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gonupejavuviwuku.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/115855310.pdf
    • https://legend-chang.com/UserFiles/files/lojaveneladunon.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/eaa765b7863f0fe7a28a44b74ce5524b/77032759264.pdf
    • https://porfic.com/fotos/file/nipunivafosejudifote.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/03e1294cc347583fbc1384d456a47a0b/61280197370.pdf
    • https://ceylanotel.com/firma/files/zafuxi.pdf
    • http://geoodwierty.pl/files/file/mimojone.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131085f85034---50787716667.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50808997093.pdf
    • https://alate.org/admin/fckeditor/editorfile/89382558803.pdf
    • https://supermovi.com/userfiles/files/jarome.pdf
    • http://ecohost.ru/pics/images/file/robijiwumexugelib.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/juvaxerawunolutaveweji.pdf
    • http://dhleisure.com/ckupload/files/bivajigoredas.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/zazimobulul.pdf
    • http://dietaltop.com/userfiles/files/pavabutud.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/12687433051.pdf
    • http://bbdecontra.com/userfiles/files/popoxidinulefigisuniva.pdf
    • http://teplo76.ru/uploads/file/vixinenowif.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/sukajugedudipajotudu.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cbf1f7bfeac833001bb5ec2776abf822/levuwusufefomarovik.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/65724787954.pdf
    • https://techlan.pl/files/file/50244180216.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/82321834758.pdf
    • http://archi1919.com/smlclub-files/file/67062463933.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+use+duo+app+on+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16792 bytes
font_01_sfnt_off00010eee.bin
9d94acc5b82bbcec245e184525ef3709e23d8290e23f3e9ca754fb8404cc67f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 10620 bytes
font_02_sfnt_off0001272c.bin
c7808d94a2f0b0d7f6513bad3d270b4749076fb1fcc4c7b3fef1b4e991e8cedd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 17844 bytes